Ok what is the rest of the question
Ypu would subtract Y from the other points Y

Then you would subtract X from the ither points X.

Then you would put the Y value over the X

Then simiplify
Answer:
We need some aditional data. For example, the average number of students who like to snorkel in certain population.
Step-by-step explanation:
You can set up an system of equations
x=2y+8
x-y=25
Substitute x in to the second equation
2y+8-y=25
y+8=25
y=17
Substitute the y back in to the first equation.
x=2(17)+8=42
-2.964 Your welcomeeeeeeeee